Aproblem is given below. instead of trying to solve that problem, state a simpler problem and solve it instead thirteen people are being honored for their work in reducing pollution. in how many ways can we line up these people for a picture? which of the following is a simpler version of the given problem? o a. in how many ways can fifteen people be lined up for a picture? o b. in how many ways can three people be selected from a group of thirteen people? o c. in how many ways can three people be lihed up for a picture? o d. in how many ways can thirteen people be selected from a group of fifteen people? what is the solution to this simpler problem? ways click to select your answeris) here to search q g

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.

Siri can type 90 words in 40 minutes about how many words would you expect her to type in 10 minutes at this rate